Hi Sasha!
If you are listing short quotes, the comma goes outside the quotation marks. As you probably know, when we list things in English, each item needs a comma after it (except for the penultimate item). The correct format for your sentence above would be:
You can see responses such as: "This is deeply disappointing", "I won't buy this game if it's NFT", "I lost interest in the game", etc.
We include commas INSIDE the quotation marks if the quote is being split up. For example:
"This is deeply disappointing," replied one of the players.
Besides this case, we wouldn't include a comma at the end of a phrase in quotation marks otherwise, even if it is included in the original text.
I hope this is clear!